I would not even respond to them anymore. Let them pick up their stuff and be gone. Terminated parents are going to be angry.

My response to the "she only acts out at your home"? Then it is clear to me that my daycare is not a good fit for her.

Immediate term in the future. There is nothing wrong with telling them you don't want her back in your care, and in a case of aggression, you don't want the liability that an extra week brings.